Hadoop MapReduce CPU time not showing

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Hadoop MapReduce CPU Time not Showing

If you’re running Hadoop MapReduce and not seeing any CPU time being used, there are a few potential causes.

First, check to make sure that your MapReduce.task tracker.map.tasks.maximum and MapReduce.task tracker.reduce.tasks.maximum properties are set high enough. If they’re too low, your tasks will finish too quickly to show up in the CPU usage statistics.

Second, make sure that you’re actually running a map and reduce tasks. If you’re only running mappers or only reducers, you won’t see any CPU time used for the other type of task.

Finally, check the TaskTracker web UI to see if your tasks are being run on the nodes you expect them to be run on. If not, there may be a configuration issue that’s causing your tasks to be routed to nodes that don’t have enough capacity to run them effectively.

How to fix it

If you’re noticing that your Hadoop MapReduce CPU time isn’t showing up in your web UI, there are a few potential fixes.

First, check to see if the TaskTracker process is running on the node where you’re seeing the issue. The TaskTracker process is responsible for sending task information back to the JobTracker, so if it’s not running, your job information won’t be updated.

If the TaskTracker is running, try restarting it. Sometimes, the process can get stuck and a restart will fix the issue.

Finally, if neither of those solutions works, you may need to adjust your Hadoop configuration. The MapReduce.task tracker.map.tasks.maximum and MapReduce.task tracker.reduce.tasks.maximum properties control how many tasks each TaskTracker can run simultaneously. If these properties are set too low, it could explain why your CPU time isn’t being updated properly.

If you’re still having trouble after trying all of these solutions, reach out to the Hadoop community for help. There are plenty of experienced users who would be happy to lend a hand.

Other ways to improve your Hadoop performance

There are a few other potential ways you can improve the performance of your Hadoop setup. For example, you can:

-Try using a different file format for your data. A parquet is a good option that is often used in conjunction with Hadoop.

-Look into using caching to improve performance. For example, you could use the Memcached service to cache frequently accessed data.

-Consider using a different scheduler. The default scheduler that comes with Hadoop (the capacity scheduler) is not always the best option. There are other schedulers available, such as the fair scheduler, that may provide better performance.


It looks like there may be a problem with the way Hadoop is reporting CPU time for MapReduce jobs. If you’re noticing that the CPU time isn’t being reported correctly, you may want to check with your Hadoop administrator to see if there’s a fix available. In the meantime, you can try running your jobs with the “-Dmapreduce.job.show-counter=totalCpuTime” option to see if that provides more accurate results.

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